Chat GPT's attempt at Scott's Tech Test

index.ts

const convertNumbersToWords = (num: number): string => {
  const words = ["zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"];
  const tens = ["", "", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"];

  if (num < 20) {
    return words[num];
  } else if (num < 100) {
    return tens[Math.floor(num / 10)] + (num % 10 !== 0 ? " " : "") + words[num % 10];
  } else if (num < 1000) {
    return words[Math.floor(num / 100)] + " hundred" + (num % 100 !== 0 ? " and " : "") + convertNumberToWords(num % 100);
  } else if (num < 1000000) {
    return convertNumberToWords(Math.floor(num / 1000)) + " thousand" + (num % 1000 !== 0 ? " " : "") + convertNumberToWords(num % 1000);
  } else {
    return convertNumberToWords(Math.floor(num / 1000000)) + " million" + (num % 1000000 !== 0 ? " " : "") + convertNumberToWords(num % 1000000);
  }
};

const convertCurrencyToWords = (amount: number): string => {
  const dollars = Math.floor(amount);
  const cents = Math.round((amount - dollars) * 100);
  const dollarsText = dollars === 0 ? "zero dollars" : convertNumberToWords(dollars) + " dollars";
  const centsText = cents === 0 ? "zero cents" : convertNumberToWords(cents) + " cents";

  if (dollars === 0) {
    return centsText;
  } else if (cents === 0) {
    return dollarsText;
  } else {
    return dollarsText + " and " + centsText;
  }
};

console.log(convertCurrencyToWords(1234.56)); // outputs "one thousand two hundred and thirty-four dollars and fifty-six cents"
console.log(convertCurrencyToWords(100)); // outputs "one hundred dollars"
console.log(convertCurrencyToWords(0.01)); // outputs "one cent"



// Tests Cases to use during testing
const testCases: [number, string][] = [
  [0, "zero dollars"],
  [0.01, "one cent"],
  [0.99, "ninety-nine cents"],
  [1, "one dollar"],
  [1.01, "one dollar and one cent"],
  [100, "one hundred dollars"],
  [100.01, "one hundred dollars and one cent"],
  [1234.56, "one thousand two hundred and thirty-four dollars and fifty-six cents"],
  [999999.99, "nine hundred and ninety-nine thousand nine hundred and ninety-nine dollars and ninety-nine cents"],
  [1000000, "one million dollars"],
];